public class Dog {
    string name;
    int age;
    float weight;

    public void eat() {
        System.out.println(name + "正在吃饭");
    }
    public void sleep(){
        System.out.println(name+"正在睡觉");
    }
    void bark(){
        System.out.println(name+"汪汪叫");
    }
}
